chiefmarketer.com

Wk8xN TIL in 1992, Barqs rootbeer ran a promotion giving away USSR memorabilia with proof of purchase as a Communism is going out of business sale, resulting in a 30% increase in sales.
4X066 TIL that Taco Bell announced in 2001 that it would give a free taco to the entire US population if Russia's MIR space station would land in a 40x40 foot target they set up in Australia. The space station ended up missing by 12 kilometers, and Taco Bell made a "consolation" offer of two tacos for $1.
wLeaW TIL that in 2006 Prince did a 'Willy Wonka' and made Universal hide 14 purple tickets—seven in the U.S. and seven internationally—inside his latest album, 3121. Fans who found a purple ticket were invited to attend a private performance at Prince's Los Angeles home.